If you need to look up a specific code for an address, use these official resources:
Use this for a more precise 9-digit code (e.g., 83702-1234). Quick Reference for Major Idaho Cities Primary ZIP Code Boise Pocatello Idaho Falls Twin Falls Coeur d'Alene Best Practices for Addressing Mail Use All Caps: The USPS prefers "ZIP Code" in uppercase. Id.zip
Search by full address or by city and state. If you need to look up a specific
The search result for likely refers to the Zone Improvement Plan (ZIP) Codes used specifically within the state of Idaho (ID) . Idaho ZIP Code Structure Id.zip
Adding the extra four digits can speed up delivery.